Nice ones...and I think they do indeed exist. I used to live in a haunted house built on area that was very sacred to the Native American people who lived here before the Europeans arrived...lots of shadow figures and odd breathing/noises in that place. I'm going to go with they cross over through a portal...just my big thought for a Tuesday morning, lol
Through a certain period of my life I was reading the books of Carlos Castaneda so I'd rather admit they do exist, indeed. Never tried mushrooms, though :D I'd love to do such a spiritual travel, as I think the Native Americans do...